I agree with a prior post of UnitQ666, extreme hardcore features (gagging, tearing masquera, semen through nose) would be a perfect addition.
Also, the debate of new girls should be out of the question for now. As I've been reading, this thing can cost 15$, 20$ or 40$ ...per month?
That's expensive as fuck for something that, as it has been pointed in this thread, needs a lot of work on its controls. Don't get me wrong, it's amazing, but you should be able to do all things quickly and intuitively with the mouse (we need an empty hand for...erm...stuff) but we have:
-No PoV, that helmet needs to GTFO.
-No camera x/y panning! <- This one is super basic, but super used, HS without camera panning would suck. If you make a closeup but you want to focus on her chin, on her ass, or on her boobs, or just place the camera for a cool shot, i'd say it's much needed.
-No head-follows-camera toggle.
-No eyes-follow-camera toggle.
-The game features an HDR cubemap as a background, but the characters are too up with respect to the ground. blurring the HDR and adding some floor as shadow catcher would improve the overall visual atmosphere.
-You can't rotate the HDR, which it would be pretty cool and pretty easy to do.
-If you make the male invisible, you loose the option of set his posture or his hands. This should be a transparency slider.
-Girls models need a lot of work. If you try to make them bustier, most of them start to clip with their clothing, and worse, the breast size is just a scalator in some polygons in the chest area (Which is not how they should work. I refer again to HS and illusion games in that matter) So before adding new ones, the focus with girls should be making their models better to this game. There are a lot of 3d porn artists that could help or lend their models to this matter.
-For some reason, there's an option to turn jizz red, but it should be a color slider, or something, i say it is too transparent, and not enough white.
-If you change the posture of a girl, it resets, the breast size, the clothing, the dick size...Also dick size shouldn't reset when you switch between girls.
-Aiming for cumming works super weird
-Placing the guy's hips and the girl's head in some positions takes a real effort and complexity, and it kinda kills the buzz when you are erhm....doing stuff.
-There are a lot of girls that've been doing voices for some porn VNs (some of those for download here in f95). Making new voice overs for the characters instead of using generic voicelines from their games would be cool
This can be a fantastic product, and I (amongst others, I'm sure) would be thrilled to pledge if it achieve the minimum standards, until then, charging 20 bucks for something in this state...damn, nope.